Rich bog & lean hesitatin

[AdamXP800]

Just for my knowledge, could some explain the difference in how a 787 acts between a lean hesitation and a rich bog.

Like when going from idle what does the engine do; if it is bogging out? If it is running lean? Thanks guys

Can an overly rich carb be bad enough to where if you hit the throttle it will begin to die or even die on the water. Or is that a lean condition


Long live the 2 stroke Seadoo!

 

[Sportster-2001-951C-Stock]

I'd love to. And I'll keep your terminology although I call a lean hesitation a lean bog b/c to me a bog is a bog, from the old days of the Rochester Quadrajet (AKA: "Quadrabog"). Best carb ever made if you know how to tune it, IMO.

Your question(s).....
A lean hesitation on a 2-stroke most often will cause flat throttle response and lead to the engine quitting b/c it's running out of fuel. A rich bog will tend to four-stroke like the engine is only hitting every other compression stroke, and most often can clear out the excess fuel if the problem isn't excessive.

On your last question, it sounds like the carb you describe is too lean b/c the engine falls flat on it's face and quits. The engine doesn't normally quit if slightly rich, it "four-strokes" and eventually clears out, you might notice a fuel smell and sooty exhaust as the excess fuel clears out through the cylinders and exits the exhaust.

If you think your carb is lean you can add some extra fuel to offset the lean condition by applying choke at the same instant (ie: slightly before) the engine falls on it's face and if the throttle response improves it's indicative of lack of fuel.